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Because of the developing environment, the occurring conditions and the randomness, uncertainty and fuzziness of mine water inrush, it is a very complex nonlinear system to determination of mine water inrush sources. Artificial neural network is of the stronger self-organization, self-adaptability and self-learning capability, which is specially suited to solve nonlinear problems. In the paper, we...
The unloading injury and constitutive equation of unloading rock mass isn't linear. Therefore, the similar design method of unloading rock mass can't be designed according to the linear elastic constitutive model. So the dimensional analysis is adopted. The result shows that there are only two basic similar scales if the complete geometric similarity is used. All other similar scales can be deduced...
A disturbance accommodating Linear Quadratic Regulator (LQR) method was applied in pitch control system to achieve good performance. The disturbance can be estimate by designing state estimator, and a feedback was added into the input to eliminate disturbance effect. The feed back matrix was calculated in accordance to LQR theory. A wind turbine dynamic modal was set up, and simulation of the control...
Because noise subspace estimation for blind channel estimation can't achieve a good trade-off between convergence speed and steady-state error, and an ambiguous complex coefficient exists between estimated and actual channel impulse response. In this paper, we propose a blind channel estimation algorithm based on noise subspace estimation algorithm with adaptive variable step-size and ambiguous complex...
Maximum likelihood (ML) detection algorithm is the best method for multi-user detection, but it has high computational complexity. This paper presents a view of this issue to its rapid and effective method, that is, complex spherical decoding algorithm. This algorithm not only maintains good performance of the ML detection, but also has a low computational complexity. On the other hand, the multi-carrier...
In this paper, modeling of parallel three-phase converters is first presented. Then definition of the circulating currents of paralleled converters and the circulating-current-generating mechanism are clearly explained. Thus, based on this definition, an averaged model of the circulating current is proposed. It is seen from this model that the circulating current consists of mainly the zero-sequence...
With a common DC bus, the grid-connected inverter (GCI) modules are directly paralleled. The principle of the zero-sequence circulating current (ZSCC) is analyzed. A ZSCC control scheme is proposed which does not impact the other control objectives such as the active and reactive power transmitted from the grid-connected inverter to the gird. A simulation model of a paralleled inverter with three...
Direct-drive wind power system needs a full-scale power converter to transmit the variable frequency electrical power to the grid. In order to improve the low voltage ride through (LVRT) capability, the grid-connected inverter (GCI) should work at a unity, a leading or a lagging power factor. Traditional control methods are complicated and output waveform is distorted by dead time. This paper introduces...
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